Field enhancement with classical electromagnetically induced transparency

A key challenge in the design of tunable and nonlinear metamaterials is creating large local electromagnetic fields to enhance the nonlinear interaction. An attractive way to achieve local field enhancement is the use of metamaterials with dark resonators, i.e., with meta-atoms that do not directly couple to the external field. Such metamaterials exhibit a scattering response that is similar to what is observed for electromagnetically induced transparency (EIT): they combine large group delay with low absorption at the same frequency. Classical EIT metamaterials are interesting for nonlinear metamaterials because of the large field enhancement due to the lack of radiation loss in the dark element and for tunable metamaterials because of the high sensitivity of the resonance to the environment or a control signal. We discuss the design and modeling of EIT metamaterials and some early work on their applications to media with nonlinear/tunable response

Field enhancement with classical electromagnetically induced transparency

A key challenge in the design of tunable and nonlinear metamaterials is creating large local electromagnetic fields to enhance the nonlinear interaction. An attractive way to achieve local field enhancement is the use of metamaterials with dark resonators, i.e., with meta-atoms that do not directly couple to the external field. Such metamaterials exhibit a scattering response that is similar to what is observed for electromagnetically induced transparency (EIT): they combine large group delay with low absorption at the same frequency. Classical EIT metamaterials are interesting for nonlinear metamaterials because of the large field enhancement due to the lack of radiation loss in the dark element and for tunable metamaterials because of the high sensitivity of the resonance to the environment or a control signal. We discuss the design and modeling of EIT metamaterials and some early work on their applications to media with nonlinear/tunable response

Fano Resonances in the Linear and Nonlinear Plasmonic Response

Fano resonances manifest novel phenomena both in linear and nonlinear response of plasmonic nanomaterials. They can extend the lifetime of plasmonic excitations, enabling the operation of nanolasers, or they can increase the fluorescence of quantum emitters. They also provide control over nonlinear optical processes such as second harmonic generation and surface enhanced Raman scattering. Fano resonances can both enhance and suppress nonlinear response. Interference of two or more absorption/conversion paths is responsible for the appearance of these effects. In this Chapter, we demonstrate explicitly—on a single equation—how path interference takes part in linear and nonlinear Fano resonances